To collect the data necessary to achieve these objectives, Euclid is equipped with a telescope observing both in visible light and infrared that will measure the shape and redshift of galaxies and groups of galaxies to identify the distance between the two. The analysis stretches back to 10 billion years ago, thus covering the period during which dark energy played a significant role in accelerating the expansion of the universe. The launch is plannedfor 2020. The mission name refers to Euclid, a Greek mathematician considered the father of geometry.